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January 24, 2000
News this month
New study links secondhand smoke to health problems in children
In November,
the National Cancer Institute made available the most comprehensive
report ever conducted on the health risks of secondhand smoke. The
430-page report is a compilation of years of research and dozens of
studies on various health effects of secondhand smoke in adults and
children. The complete monograph, titled "Health Effects of
Exposure to Environmental Tobacco Smoke" is available free
online by following a link at the bottom of this page.
[Environmental tobacco smoke] causes increases
in sudden infant death syndrome, middle ear infections, asthma, bronchitis
and pneumonia.
Perhaps most troubling is new evidence that links secondhand smokealso
called environmental tobacco smoke or ETSwith various health
problems of infants and children. Studies show that ETS causes increases
in sudden infant death syndrome, middle ear infections, asthma, bronchitis
and pneumonia. The seriousness of the data in the report prompted
U.S. Environmental Protection Agency Chief Carol Browner to suggest
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all parents protect their children from exposure to secondhand
cigarette smoke whenever possible."
Focusing on respiratory problems
An 80-page chapter of the new report focuses on a host of childhood
respiratory problems caused or made worse by ETS. Children are especially
vulnerable because their lungs are still developing. In one particular
study, children exposed to ETS had significant increases in respiratory
illnesses, including
- 21 percent more days of restricted activity
- 31 percent more days of bed confinement
- 39 percent more days of school absence than those not exposed.
Dozens of other studies
linked secondhand smoke with recurrent symptoms of coughing, wheezing
and excessive phlegm production in children, particularly for infants
and preschoolers. The report cites numerous studies showing that smoking
contributes to the initiation of asthma in thousands of children and
causes the onset of asthma attacks in thousands more.
Effects on lung development and allergies
There is also some evidence that secondhand smoking affects lung growth
and development, as measured by small but statistically significant
decreases in pulmonary function tests. These reductions may persist
into adulthood. In addition, several studies cited showed an increased
risk of atopy the first step in developing allergic conditions
in children of smoking mothers. Children with cystic fibrosis
are especially sensitive to the respiratory effects of ETS.
Secondhand smoke: a toxic blend
The report states that environmental tobacco smoke is a complex mixture
formed when cigarettes, pipes and cigars burn. Thousands of chemicals
are found in the smoke, including hydrogen cyanide, carbon monoxide
and dozens of compounds that are known carcinogens, tumor promoters
or tumor initiators. Many of these chemicals have been identified
as hazardous and are regulated by federal or state agencies.
Effects on children
In all, the researchers noted that environmental tobacco smoke directly
contributes to
- 9,700 to 18,600 cases of low birthweight babies to nonsmoking mothers
- 1,900 to 2,700 deaths from SIDS (sudden infant death syndrome)
- 0.7 to 1.6 million physician office visits for middle ear infections
- 8,000 to 26,000 new cases of asthma
- 400,000 to 1 million aggravations of asthma cases in children
- 150,000 to 300,000 cases of bronchitis or pneumonia in infants and toddlers, leading to 7,500 to 15,000 hospitalizations and 136 to 212 deaths.

Want to stop smoking? Try these online resources
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Physician Referral Online
A free and confidential service
of Yale-New Haven Hospital.
Physician Referral Online
Using your own criteria, you can request information from a database
of 900 area physicians who have registered to participate.
Request an appointment
We would be happy to assist you in scheduling an appointment with
a member of the hospital's medical staff. Use the link above or
call:
203-688-2000
or toll free
1-888-700-6543
to talk with a referral coordinator.
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Stop smokingfor the sake of the kids
In the 20 years I have been treating children with lung problems, study
after study has shown that smoking is very dangerous to everyones
healthsmokers and the people around them. Yet, despite all
the attention and evidence, thousands of people still smoke and
more start every day. Sadly, thousands of children remain exposed
to this secondhand smoke, which I find very disturbing.
Behavior can be an extremely difficult thing for people to change,
but this latest study gives many reasons why parents should try
to stop smoking. If they cant do it for themselves, maybe
they can quit for the sake of their kids.
"Smoke. . .can cause inflammation in the airways of a childs
lungs, making airways more susceptible to infection."
Harm to young lungs
Smoke from cigarettes, cigars or pipes can cause inflammation in the
airways of a childs lungs, making airways more susceptible to
infection. In addition, smoke makes these airways more sensitive,
aggravating conditions such as asthma and chronic bronchitis. The
study also notes that secondhand smoke is harmful to children born
with cystic fibrosis.
"Attempts to stop [smoking] often get a major boost when [parents]
see how much their children improve when living in a smoke-free environment."
Helping children get better
In our center at Yale-New Haven Childrens Hospital, we primarily
see children with asthma, cystic fibrosis, congenital anomalies, pneumonia
and chronic lung conditions that occurred as a result of prematurity.
We encourage all parents to stop smokingor at the very least
to not smoke around their childrenand we encourage other family
members to stop as well. Their attempts to stop often get a major
boost when they see how much their own children improve when living
in a smoke-free environment. I guess you can call that positive reinforcement
of the best kind.
The asthma connection
The current NCI study makes many points that are important for smoking
and nonsmoking parents alike to understand. There is no doubt, for
example, that smoking aggravates existing asthma and can trigger an
asthma attack in a child. Thats important to know if a child
with asthma is visiting someone who smokes. However, Im not
sure the evidence is as strong in saying secondhand smoke can cause
a child to have asthma in the first place. This report acknowledges
these data are somewhat questionable.
"...smoking aggravates existing asthma and can trigger an
asthma attack in a child."
Secondhand smoke can also lead to an increase in lung infections,
such as bronchitis and pneumonia in children. The numbers cited in
the report are staggeringliterally thousands of cases.
Smoking affects the unborn as well. What is very alarming is what
happens in the uterus to a developing baby when a pregnant woman smokes.
This study brings to light the connections between smoking and an
increase in sudden infant death syndrome, decrease in fetal growth
and now a decrease in lung size and function. These have implications
that can last a lifetime and are very important.
"The absolute best solution is to stop smoking altogether
if you are a smoker."
Making positive changes
What can be done? The absolute best solution is to stop smoking altogether
if you are a smoker. Blowing the smoke away from your child, or opening
a window, or smoking in the car when they are not around still means
that the chemicals remain in the air, on your clothes, in your hair.
If you smoke, there is a higher concentration of these chemicals in
your house, even if you are not smoking just then. And with every
breath, you and your children take them in.
If you don't smoke, politely ask family members, friends and
babysitters not to smoke around your children. If you use day care,
make sure that environment is also smoke-free. As this report clearly
shows, there's too much at stake not to.
Dr. Haddad is a
pediatric respiratory specialist who treats children at Yale-New Haven
Childrens Hospital. He is professor and chief of pediatric respiratory
medicine at Yale University School of Medicine.
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